PIKSI GPS project is an open source, fast, this is their bootloader program for programming FLASH, worth a visit, for the operation is relatively subtle stm32f4

piksi_bootloader-master
.......................\.gdbinit
.......................\.gitignore
.......................\.gitmodules
.......................\LICENSE
.......................\Makefile
.......................\README
.......................\libopencm3
.......................\libswiftnav
.......................\src
.......................\...\Makefile
.......................\...\board
.......................\...\.....\leds.c
.......................\...\.....\leds.h
.......................\...\.....\m25_flash.c
.......................\...\.....\m25_flash.h
.......................\...\.....\max2769.h
.......................\...\.....\nap
.......................\...\.....\...\nap_common.c
.......................\...\.....\...\nap_common.h
.......................\...\.....\...\nap_conf.c
.......................\...\.....\...\nap_conf.h
.......................\...\.....\...\nap_exti.h
.......................\...\error.c
.......................\...\error.h
.......................\...\flash_callbacks.c
.......................\...\flash_callbacks.h
.......................\...\main.c
.......................\...\main.h
.......................\...\peripherals
.......................\...\...........\spi.c
.......................\...\...........\spi.h
.......................\...\...........\stm_flash.c
.......................\...\...........\stm_flash.h
.......................\...\...........\usart.c
.......................\...\...........\usart.h
.......................\...\...........\usart_rx.c
.......................\...\...........\usart_tx.c
.......................\...\sbp.c
.......................\...\sbp.h
.......................\...\sbp_piksi.h
.......................\...\settings.c
.......................\...\settings.h
.......................\stm32
.......................\.....\Makefile.include
.......................\.....\bootloader.ld
.......................\.....\swiftgnss.cfg
.......................\.....\swiftnav.cfg

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